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Akram B, Ni B, Wang X. Van der Waals Integrated Hybrid POM-Zirconia Flexible Belt-Like Superstructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1906794. [PMID: 31773834 DOI: 10.1002/adma.201906794] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 11/04/2019] [Indexed: 06/10/2023]
Abstract
A facile one-step solvothermal approach to engineer a van der Waals integrated heteromaterial self-assembled superstructure composed of two structurally distinct species that is polyoxomolybdate and zirconia (POM-ZrO2 ) is reported. Nonclassical aggregation-based self-assembly process grows the superstructure. The introduced POM not only behaves as a catalytically active component of the hybrid structure but also imparts flexibility to the developed POM-ZrO2 superstructures. The material shows high performance toward oxygenation of thioethers as a result of its morphology, composition, and structure. This growing strategy may introduce a viable pathway to the rational design of Van der Waals integrated complex hybrid, catalytically active assemblies with potential applications in different fields.
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Affiliation(s)
- Bilal Akram
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Bing Ni
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Xun Wang
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
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2
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LaGrow AP, Besong TMD, AlYami NM, Katsiev K, Anjum DH, Abdelkader A, Costa PMFJ, Burlakov VM, Goriely A, Bakr OM. Trapping shape-controlled nanoparticle nucleation and growth stages via continuous-flow chemistry. Chem Commun (Camb) 2018; 53:2495-2498. [PMID: 28184392 DOI: 10.1039/c6cc08369b] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Continuous flow chemistry is used to trap the nucleation and growth stages of platinum-nickel nano-octahedra with second time resolution and high throughputs to probe their properties ex situ. The growth starts from poorly crystalline particles (nucleation) at 5 seconds, to crystalline 1.5 nm particles bounded by the {111}-facets at 7.5 seconds, followed by truncation and further growth to octahedral nanoparticles at 20 seconds.
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Affiliation(s)
- Alec P LaGrow
- King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering (PSE), Thuwal 23955-6900, Saudi Arabia. and York Nanocentre, University of York, Heslington, York YO10 5DD, UK.
| | - Tabot M D Besong
- King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering (PSE), Thuwal 23955-6900, Saudi Arabia.
| | - Noktan M AlYami
- King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering (PSE), Thuwal 23955-6900, Saudi Arabia.
| | - Khabiboulakh Katsiev
- King Abdullah University of Science and Technology (KAUST), SABIC Corporate Research and Innovation Center, Thuwal, 23955-6900, Saudi Arabia
| | - Dalaver H Anjum
- King Abdullah University of Science and Technology (KAUST), Imaging and Characterization Lab, Thuwal 23955-6900, Saudi Arabia
| | - Ahmed Abdelkader
- King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering (PSE), Thuwal 23955-6900, Saudi Arabia.
| | - Pedro M F J Costa
- King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering (PSE), Thuwal 23955-6900, Saudi Arabia.
| | | | - Alain Goriely
- Mathematical Institute, University of Oxford, Oxford, OX2 6GG, UK
| | - Osman M Bakr
- King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering (PSE), Thuwal 23955-6900, Saudi Arabia.
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Luty-Błocho M, Wojnicki M, Grzonka J, Kurzydłowski KJ, Fitzner K. Linking the Gold Nanoparticles Formation Kinetics with Their Morphology. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21152] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- M. Luty-Błocho
- AGH University of Science and Technology; Faculty of Non-Ferrous Metals; 30-059 Krakow Poland
| | - M. Wojnicki
- AGH University of Science and Technology; Faculty of Non-Ferrous Metals; 30-059 Krakow Poland
| | - J. Grzonka
- Warsaw University of Technology; Faculty of Materials Science and Engineering; 02-507 Warsaw Poland
- Institute of Electronic Materials Technology; 01-919 Warsaw Poland
| | - K. J. Kurzydłowski
- Faculty of Mechanical Engineering; Białystok University of Technology; 15-351 Białystok Poland
| | - K. Fitzner
- AGH University of Science and Technology; Faculty of Non-Ferrous Metals; 30-059 Krakow Poland
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Prévot G, Nguyen NT, Alloyeau D, Ricolleau C, Nelayah J. Ostwald-Driven Phase Separation in Bimetallic Nanoparticle Assemblies. ACS NANO 2016; 10:4127-4133. [PMID: 26989906 DOI: 10.1021/acsnano.5b07377] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The compositional stability of bimetallic nanoparticles (NPs) is crucial for many applications. We have studied the coarsening of amorphous carbon-supported Au-Pd NPs during annealing at 873 K. Using scanning transmission electron microscopy and energy-dispersive spectroscopy measurements, we show that, despite a complete miscibility of the two metals, the particle assembly undergoes a phase separation during annealing, which leads to two distinct populations: Au-rich NPs with a mean radius of 3.5 nm and large Pd-rich NPs with a mean radius of 25 nm. Thermodynamic calculations and kinetic Monte Carlo simulations explain this behavior that is driven by the competition between surface and mixing energy and by the different mobilities of the two atomic species.
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Affiliation(s)
- Geoffroy Prévot
- Sorbonne Universités, UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 75005 Paris, France
| | - Nhat Tai Nguyen
- Laboratoire de Matériaux et Phénomènes Quantiques, Bâtiment Condorcet, CNRS UMR 7162, Université Paris Diderot , 75013 Paris, France
| | - Damien Alloyeau
- Laboratoire de Matériaux et Phénomènes Quantiques, Bâtiment Condorcet, CNRS UMR 7162, Université Paris Diderot , 75013 Paris, France
| | - Christian Ricolleau
- Laboratoire de Matériaux et Phénomènes Quantiques, Bâtiment Condorcet, CNRS UMR 7162, Université Paris Diderot , 75013 Paris, France
| | - Jaysen Nelayah
- Laboratoire de Matériaux et Phénomènes Quantiques, Bâtiment Condorcet, CNRS UMR 7162, Université Paris Diderot , 75013 Paris, France
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Wei X, Zhou R, Lefebvre W, He K, Le Roy D, Skomski R, Li X, Shield JE, Kramer MJ, Chen S, Zeng XC, Sellmyer DJ. Structural and magnetic evolution of bimetallic MnAu clusters driven by asymmetric atomic migration. NANO LETTERS 2014; 14:1362-1368. [PMID: 24517293 DOI: 10.1021/nl404412w] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The nanoscale structural, compositional, and magnetic properties are examined for annealed MnAu nanoclusters. The MnAu clusters order into the L1(0) structure, and monotonic size-dependences develop for the composition and lattice parameters, which are well reproduced by our density functional theory calculations. Simultaneously, Mn diffusion forms 5 Å nanoshells on larger clusters inducing significant magnetization in an otherwise antiferromagnetic system. The differing atomic mobilities yield new cluster nanostructures that can be employed generally to create novel physical properties.
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Affiliation(s)
- Xiaohui Wei
- Department of Physics and Astronomy, University of Nebraska , Lincoln, Nebraska 68588, United States
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Mallamace F, Corsaro C, Stanley HE, Mallamace D, Chen SH. The dynamical crossover in attractive colloidal systems. J Chem Phys 2013; 139:214502. [DOI: 10.1063/1.4833595] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Pan J, El-Ballouli AO, Rollny L, Voznyy O, Burlakov VM, Goriely A, Sargent EH, Bakr OM. Automated synthesis of photovoltaic-quality colloidal quantum dots using separate nucleation and growth stages. ACS NANO 2013; 7:10158-66. [PMID: 24131473 DOI: 10.1021/nn404397d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
As colloidal quantum dot (CQD) optoelectronic devices continue to improve, interest grows in the scaled-up and automated synthesis of high-quality materials. Unfortunately, all reports of record-performance CQD photovoltaics have been based on small-scale batch syntheses. Here we report a strategy for flow reactor synthesis of PbS CQDs and prove that it leads to solar cells having performance similar to that of comparable batch-synthesized nanoparticles. Specifically, we find that, only when using a dual-temperature-stage flow reactor synthesis reported herein, are the CQDs of sufficient quality to achieve high performance. We use a kinetic model to explain and optimize the nucleation and growth processes in the reactor. Compared to conventional single-stage flow-synthesized CQDs, we achieve superior quality nanocrystals via the optimized dual-stage reactor, with high photoluminescence quantum yield (50%) and narrow full width-half-maximum. The dual-stage flow reactor approach, with its versatility and rapid screening of multiple parameters, combined with its efficient materials utilization, offers an attractive path to automated synthesis of CQDs for photovoltaics and, more broadly, active optoelectronics.
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Affiliation(s)
- Jun Pan
- Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
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Smith NAS, Burlakov VM, Ramos ÁM. Mathematical Modeling of the Growth and Coarsening of Ice Particles in the Context of High Pressure Shift Freezing Processes. J Phys Chem B 2013; 117:8887-95. [DOI: 10.1021/jp403366a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. A. S. Smith
- Instituto de Matemática Interdisciplinar,
Departamento de Matemática Aplicada, Facultad de Ciencias Matemáticas, Universidad Complutense de Madrid, Plaza de Ciencias
3, 28040, Madrid, Spain
| | - V. M. Burlakov
- Mathematical Institute, OCCAM, University of Oxford, 24-26 St Giles, Oxford OX1 3LB, U.K
| | - Á. M. Ramos
- Instituto de Matemática Interdisciplinar,
Departamento de Matemática Aplicada, Facultad de Ciencias Matemáticas, Universidad Complutense de Madrid, Plaza de Ciencias
3, 28040, Madrid, Spain
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Mallamace F, Corsaro C, Stanley HE, Chen SH. The role of the dynamic crossover temperature and the arrest in glass-forming fluids. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2011; 34:94. [PMID: 21947896 DOI: 10.1140/epje/i2011-11094-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Accepted: 07/04/2011] [Indexed: 05/31/2023]
Abstract
We discuss the role of the dynamic glass-forming fragile-to-strong crossover (FSC) in supercooled liquids. In the FSC, significant dynamic changes such as the decoupling (the violation of the Stokes-Einstein relation) of homologous transport parameters, e.g., the density relaxation time τ and the viscosity η, occur at a characteristic temperature T(c). We study the FSC using a scaling law approach. In particular, we use both forms of the mode-coupling theory (MCT): the original (ideal) and the extended form, which explicitly describes energy hopping processes. We demonstrate that T(c) plays the most important physical role in understanding dynamic arrest processes.
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Affiliation(s)
- F Mallamace
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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